Apparently, anyone that has already bought their train ticket tomorrow can reschedule the journey for free - or exchange it for a travel voucher for future travel - but they only have until 6pm to do it. I know most of you would have walked/driven, but it might be useful for anyone further afield. After 6pm, there is a fee up until the time the train departs. https://www.nationalrail.co.uk/times_fares/ticket_types/46594.aspx